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A general description is here.
‘type.convert()’, ‘read.table()’ and similar ‘read.*()’ functions get a new ‘exact’ argument, specifying how numeric input is converted when its conversion to double precision loses accuracy. The default ‘exact = FALSE’ allows accuracy loss, as in all R versions before 3.1.0.
For some compiler versions, integer addition could accidentally overflow (without a warning). R's internal code should be more “robust” now, thanks to Hervé Pagès. (PR#15774)
The ‘"CRAN"’ filter (see ‘available.packges()’) no longer removes duplicates other than of packages on CRAN.
‘dnbinom(x, size = <large>, mu, log = TRUE)’ no longer underflows to -Inf for large ‘mu’, thanks to a suggestion from Alessandro Mammana (MPI MolGen, Berlin).
‘pbeta(x, a, b, log = TRUE)’ no longer behaves discontinuously (in a small x-region) because of denormalized numbers.